If the storage alert appears on your tablet, you will need to follow the below steps in order to clear your memory;
1. Before you empty the second bin, on your PIMS sync screen please make sure you have no outstanding jobs awaiting upload.
2. Head into PIMS sync screen you will notice two bins down at the bottom of the screen, one will be called user files and other will be called PIMS files. Please do not empty the first bin, the second one, PIMS Files, is the one you need to clear, click on this to empty.
Also clearing your image gallery will free up memory.